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24 January, 15:27

PS!

... - 4 (7a + 5) = - 160

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  1. 24 January, 18:02
    0
    4 (7a + 5) = - 160

    mutiply the bracket by 4

    (4) (7a) (4) (+5) = - 160

    28a+20 = - 160

    move + 20 to the other side

    sign changes from + 20 to - 20.

    28a+20-20 = - 160-20

    28a = - 180

    Divide by 28

    28a/28 = - 180/28

    x = - 180/28

    reduce by dividing 4

    -180/4 = - 45

    28/4 = 7

    -45/7 or - 6 3/7

    Answer : x = - 45/7, x = - 6 3/7
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